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Two identical flutes produce fundamental notes of frequency 300 Hz at $27^{\circ}C$. If the temperature of the air in one of the flutes is increased to $31^{\circ}C$, the number of beats heard per seconds will be :

$\begin {array} {1 1} (1)\;3 & \quad (2)\;2 \\ (3)\;1 & \quad (4)\;4 \end {array}$

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(2) 2
answered Nov 7, 2013 by pady_1

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